Netflix Surround -

Mobile devices default to stereo to save bandwidth. Casting to a TV may reactivate surround.

What Surround Sound Formats Does Netflix Support? Netflix supports several surround sound formats depending on your subscription plan, device, and content: netflix surround

Yes, but only when system audio is set to “Dolby Atmos” (requires HDMI to Atmos AVR). Mobile devices default to stereo to save bandwidth